content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import java.util.Collection;
  import java.util.concurrent.Callable;
  
  import io.reactivex.common.Disposable;
  import io.reactivex.common.exceptions.Exceptions;
  import io.reactivex.common.internal.disposables.DisposableHelper;
  import io.reactivex.common.internal.functions.*;
  import io.reactivex.observable.*;
  import io.reactivex.observable.internal.disposables.EmptyDisposable;
  
  public final class ObservableToList<T, U extends Collection<? super T>>
  extends AbstractObservableWithUpstream<T, U> {
  
      final Callable<U> collectionSupplier;
  
      @SuppressWarnings({ "unchecked", "rawtypes" })
      public ObservableToList(ObservableSource<T> source, final int defaultCapacityHint) {
          super(source);
          this.collectionSupplier = (Callable)Functions.createArrayList(defaultCapacityHint);
      }
  
      public ObservableToList(ObservableSource<T> source, Callable<U> collectionSupplier) {
          super(source);
          this.collectionSupplier = collectionSupplier;
      }
  
      @Override
      public void subscribeActual(Observer<? super U> t) {
          U coll;
          try {
              coll = ObjectHelper.requireNonNull(collectionSupplier.call(), "The collectionSupplier returned a null collection. Null values are generally not allowed in 2.x operators and sources.");
          } catch (Throwable e) {
              Exceptions.throwIfFatal(e);
              EmptyDisposable.error(e, t);
              return;
          }
          source.subscribe(new ToListObserver<T, U>(t, coll));
      }
  
      static final class ToListObserver<T, U extends Collection<? super T>> implements Observer<T>, Disposable {
          U collection;
          final Observer<? super U> actual;
  
          Disposable s;
  
          ToListObserver(Observer<? super U> actual, U collection) {
              this.actual = actual;
              this.collection = collection;
          }
  
          @Override
          public void onSubscribe(Disposable s) {
              if (DisposableHelper.validate(this.s, s)) {
                  this.s = s;
                  actual.onSubscribe(this);
              }
          }
  
  
          @Override
          public void dispose() {
              s.dispose();
          }
  
          @Override
          public boolean isDisposed() {
              return s.isDisposed();
          }
  
  
          @Override
          public void onNext(T t) {
              collection.add(t);
          }
  
          @Override
          public void onError(Throwable t) {
              collection = null;
              actual.onError(t);
          }
  
          @Override
          public void onComplete() {
              U c = collection;
              collection = null;
              actual.onNext(c);
              actual.onComplete();
          }
      }
  }
  